3871results about "Hydroxy compound separation/purification" patented technology

A process for purifying 1,3-propanediol from the fermentation broth of a cultured E. coli that has been bioengineered to synthesize 1,3-propanediol from sugar is provided. The basic process entails filtration, ion exchange and distillation of the fermentation broth product stream, preferably including chemical reduction of the product during the distillation procedure. Also provided are highly purified compositions of 1,3-propanediol.

A process for selective formation of ethanol from acetic acid by hydrogenating acetic acid in the presence of a catalyst comprises a first metal on an acidic support. The acidic support may comprise an acidic support material or may comprise an support having an acidic support modifier. The catalyst may be used alone to produced ethanol via hydrogenation or in combination with another catalyst. In addition, the crude ethanol product is separated to obtain ethanol.

Disclosed is a process for the removal of impurities, especially color forming impurities, from 1,3-propanediol.

A process for purifying glycerin recovered as a byproduct of biodiesel production comprises heating a glycerin effluent stream containing a low molecular weight alcohol, water and fatty acid esters of the low molecular weight alcohol to cause transesterification of the fatty acid esters to glycerides and additional low molecular weight alcohol. The reaction mixture is sparged with nitrogen to help remove water and low molecular weight alcohol, which drives the transesterification reaction towards glyceride formation. A wash water stream may also be added to the recovered glycerin stream from biodiesel production. Either before or following the transesterification reaction, an oil layer can be separated from the recovered glycerin stream by reducing the pH of the stream to below 7. Following separation of the oil layer and transesterification the glycerin stream is flash distilled to separate glycerin from water, salts, and glycerides.

This invention is directed to methods for recovery of C3-C6 alcohols from dilute aqueous solutions, such as fermentation broths. Such methods provide improved volumetric productivity for the fermentation and allows recovery of the alcohol. Such methods also allow for reduced energy use in the production and drying of spent fermentation broth due to increased effective concentration of the alcohol product by the simultaneous fermentation and recovery process which increases the quantity of alcohol produced and recovered per quantity of fermentation broth dried. Thus, the invention allows for production and recovery of C3-C6 alcohols at low capital and reduced operating costs.

A method for distilling ethanol from a mash includes feeding a fluid to a first distillation column. The fluid and a distillate of the first distillation column are delivered to a second distillation column. The fed fluid and/or distillate of the second distillation column is/are purified in a first and/or last step of the method by a membrane separation process.

A process of isolating 1,4-butanediol (1,4-BDO) from a fermentation broth includes separating a liquid fraction enriched in 1,4-BDO from a solid fraction comprising cells, removing water from said liquid fraction, removing salts from said liquid fraction, and purifying 1,4-BDO. A process for producing 1,4-BDO includes culturing a 1,4-BDO-producing microorganism in a fermentor for a sufficient period of time to produce 1,4-BDO. The 1,4-BDO-producing microorganism includes a microorganism having a 1,4-BDO pathway having one or more exogenous genes encoding a 1,4-BDO pathway enzyme and/or one or more gene disruptions. The process for producing 1,4-BDO further includes isolating 1,4-BDO.

An industrial process to obtain xanthophyll concentrates of high purity from plant extracts, comprising: refining the plant extracts by treating them with a diluted alkali, followed by treating them with a diluted organic or inorganic acid in order to eliminate impurities and undesirable components and obtaining a refined extract; saponifying the refined extract by means of a strongly alkali aqueous solution; treating the diluted saponified mass with a dilute organic or inorganic acid to adjust the pH to a value from 4 to 7, in order to separate a xanthophylls concentrate; and removing any remaining impurities by extracting them by means of hexane.

Purifying and/or recovery of ethanol from a crude ethanol product obtained from the hydrogenation of acetic acid. Separation and purification processes of crude ethanol mixture are employed to allow recovery of ethanol and remove impurities. In addition, the process involves returning acetaldehyde separated from the crude ethanol product to the reactor.

The invention belongs to the technical field of chemical industry, in particular to a purification technique for coal glycol rude products. According to the technique, saponification, carbinol-removal, hydrogenation reaction, three-column distillation and absorption treatment are utilized to prepare the glycol with a mass percent more than 99.9% from the coal glycol rude products and the polyester glycol products having high transmissivity to the ultraviolet with wavelength between 220 and 350 mm. The purification technique for coal glycol rude products of the invention is characterized by low energy consumption, easy operation and high efficiency.

The invention relates to a method for producing a wood sugar product and a byproduct of ethanol or D-ribose or citric acid. The method takes hydrolysis liquid, wood sugar mother liquor and/or production waste liquid containing pentose of agricultural or forestry waste as the raw materials, comprising the following steps: (a) preprocessing feed liquid; (b) colour spectrum separation: separating thefeed liquid into arabinose fraction feed liquid and wood sugar fraction feed liquid; (c) removing mixed sugar at least containing glucose and galactolipin; and (d) carrying out aftertreatment on thewood sugar fraction feed liquid to obtain the wood sugar product. The wood sugar product comprises xylitol and D-wood sugar. The invention has low production cost and high efficiency and is suitable for large-scale industrial production.

An improved process for separation of liquid mixtures involves vapor stripping followed by mechanical compression of the vapor which is then exposed to a permeation membrane for separation of the compressed vapor.

The present invention relates to agglomerated zeolitic adsorbents based on zeolite X with an Si/Al ratio such that 1.15<Si/Al≦1.5, at least 90% of the exchangeable cationic sites of the zeolite X of which are occupied either by barium ions alone or by barium ions and potassium ions whose Dubinin volume is greater than or equal to 0.240 cm³/g.

They are obtained by agglomerating zeolite powder with a binder, followed by the zeolitization of the binder, the exchange of the ions of the zeolite by barium ions (and potassium ions) and the activation of the adsorbents thus exchanged.

These adsorbents are particularly suited to the adsorption of the para-xylene present in C₈ aromatic hydrocarbon fractions in the liquid phase in processes of simulated moving bed type but also to the separation of sugars, polyhydric alcohols, cresols or substituted toluene isomers.

A mixture of propylene oxide and methanol is separated by liquid/liquid extraction using water and a hydrocarbon such as n-octane as extractive solvents.

An energy-efficient process for dewatering an aqueous organic solution includes using freely available solar energy to concentrate a draw solution within a reservoir. The draw solution is used in conjunction with a membrane to remove water from the organic solution in a forward osmosis process. The draw solution is diluted by the osmosis process, and returned to the reservoir to be re-concentrated and reused in the osmosis process.

The invention is a process for the purification of ethanol. In one embodiment the process comprises boiling a degassed beer feed (106) in a pre-boiler (110) to provide a vapor by-pass fraction (112) that by-passes the conventional beer column and is fed into the rectifier column (124). The process allows free capacity in the rectifier column of new or established plants to be filled by ethanol-water vapor and/or condensate streams that do not originate from the beer column.

The invention discloses a production process of ultra-high-purity isopropanol, which comprises the following process steps of: (1) delivering a feed stream containing at least 98% of industrial grade isopropanol into a molecular sieve adsorption tower from the bottom of the molecular sieve adsorption tower, dehydrating through a molecular sieve, and then flowing out of the top of the tower to obtain high-purity isopropanol of which the moisture content is less than 100ppm; (2) filtering the high-purity isopropanol taken out of the molecular sieve adsorption tower by using a filter so as to remove particles of which the sizes are more than 1mum; and (3) transferring the high-purity isopropanol which is qualified by filtering into a distillation tower and a rectification column for rectifying, then transferring the rectified high-purity isopropanol into a condenser to be condensed into high-purity liquid isopropanol, enabling the condensed high-purity liquid isopropanol after rectifying to pass through a deionized resin tank, and deionizing through ionic resin so as to obtain ultra-high-purity isopropanol of which the metallic impurity is less than 0.1ppb. The production process disclosed by the invention is carried out under the normal pressure, and has the advantages of mild reaction conditions, simple operation processes and good safety performance.

The invention relates to a method for producing L-arabinose and D-xylose, which can simultaneously produce ethanol or D-ribose or citric acid as a byproduct. The method utilizes a hydrolyzate of agricultural waste, a xylose mother liquor and/or a production waste liquor containing pentose as the raw materials and comprises the following steps: (1) pretreating the raw materials; (b) carrying out the chromatographic resolution to separate the raw materials into an arabinose-stage liquor and a xylose-stage liquor; (c1) removing fermentation inhibitors which are impurities and unwanted bacteria, which have an inhibiting effect on the fermentation; (c2) fermenting to remove unwanted saccharides at least comprising glucose and galactose; (d) and finally, respectively carrying out the post treatment on the arabinose-stage liquor and the xylose-stage liquor to obtain the L-arabinose and the D-xylose. Steps (c1) and (c2) are arranged before the chromatographic resolution in step (b) or after step (b). The method has the advantages of low production cost and high efficiency, and is suitable for large-scale industrial production.